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Phase Diagrams and Tie Lines PowerPoint PPT Presentation


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Phase Diagrams and Tie Lines. Metallurgy Background 2. Learning Activities Look up Keywords View Slides; Read Notes, Listen to lecture View Demo Do on-line workbook Do homework. Lesson Objectives When you finish this lesson you will understand: Hypo and hyper euctectoid Steels - PowerPoint PPT Presentation

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Phase Diagrams and Tie Lines

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Phase Diagrams and Tie Lines


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Metallurgy Background 2

  • Learning Activities

  • Look up Keywords

  • View Slides;

  • Read Notes,

  • Listen to lecture

  • View Demo

  • Do on-line workbook

  • Do homework

  • Lesson Objectives

  • When you finish this lesson you will understand:

  • Hypo and hyper euctectoid Steels

  • How to calculate the percent of phases present in a Two phase region.

Keywords:

Hypo-eutectoid Steel, Hyper-eutectoid Steel, Tie line, Lever rule


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HYPOEUTECTOID STEEL

Slow Cooled (Equilibrium)

Phase Changes When

Cooling From

Austenite to

Room Temperature


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Tie Line to Calculate % Ferrite and % Austenite

Austenitie

Ferrite

Lever Rule

Tie Line Demo


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Questions

  • Turn to the person sitting next to you and discuss (1 min.):

  • a hypereutectoid steel has carbon above 0.8%. What phase and percent phase do you expect at this tie line temperature?


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Demonstration

A procedure called a “tie Line” can be used to determine the amount of each phase present in a Two Phase Compositional Region on a Phase Diagram. Please work the Demonstartion called “Phase Diagram Tie Line” found on the Demonstartion Page of the WE300 Website.

Homework

Please do Assignment 6 “Metallurgy” found on the Assignment Page. Note, it will help if you do the above Demonstration first.